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Old 03-01-2009, 08:59 PM   #1
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Headshake reduction

I remember reading that Gen1 ZX-10R's are known for headshake and yada yada. I lessened the problem with a GPR Damper. HOWEVER. I'm a bit curious now, after looking at my forks the other day, I noticed they were near flush on the top triple. So, my question to you is, if I lower my front end an inch or so, will that help reduce the headshake?
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Old 03-01-2009, 09:01 PM   #2
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No, it will actually worsen it by reducing your trail.
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Old 03-01-2009, 09:03 PM   #3
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Quote:
Originally Posted by Patrick View Post
No, it will actually worsen it by reducing your trail.
My front end seems REALLY light. I just kinda figured that if I have a lower center of gravity on the front end, it would help
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Old 03-01-2009, 09:37 PM   #4
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By light do you mean it rides kind of high?
Has the suspension been set up?

Also, if I remember correctly, you maybe weigh 150?

The first gen ZX10 were sprung I want to say for someone closer to 200, so you're probably riding high on the spring travel.

One more thing, adjusting fork height in the triple tree, whether it be up or down, should be done in small increments, like 5mm or so at a time.

1" has the probability of putting you on your head and tucking the front end.

Also, in relation to it feeling light; the wheel base was very short on those bikes, making them very prone to lifting the front on acceleration, moving the wheel back a bit in the swingarm if possible by adding a link longer chain would be desirable.
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Last edited by Patrick; 03-01-2009 at 09:39 PM.
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Old 03-01-2009, 09:38 PM   #5
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well, for one, you can't lower the zx-10r forks lower in the trees an inch. i did have good luck dropping them 3mm though. and after adding a 190/55 diablo 3 to the back, i never had any problems at all with the front end. there are several threads on zx-10r.net talking about what to do with the forks.
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Old 03-01-2009, 10:01 PM   #6
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Yes, lowering the front is said to help reduce head shake but an inch is a huge amount. Patrick mentioned 5mm or about a quarter of an inch. Trust me, you'll be able to feel the difference even in that small increment.

From Hyperpro, the advice in the order of priority / most likely solution is:

1. Increase rear compression
2. Decrease front rebound
3. Increase rear rebound
4. Lower the front / raise the rear
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Old 03-01-2009, 10:03 PM   #7
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I can see what Patrick is saying about lowering the front reducing the trail. It does make sense. I see where pulling the rear back some would help also. Those 10's scare the out of me from things I have read.
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Old 03-01-2009, 10:06 PM   #8
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BTW, here is the Hyperpro cheat sheet...

HyperproSusSheetA
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Old 03-01-2009, 10:26 PM   #9
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The 10's are different than most bikes in their steering if Im not mistaken. That sheet is cool though.
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Old 03-01-2009, 11:34 PM   #10
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Quote:
Originally Posted by Patrick View Post
By light do you mean it rides kind of high?
Has the suspension been set up?
Light as in potential tankslapper wrapping out second or 3rd.
Patrick, you set up my suspension already
I was looking at my 636 and I noticed the front is dropped 3/4"


Quote:
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i did have good luck dropping them 3mm though. and after adding a 190/55 diablo 3 to the back, i never had any problems at all with the front end. there are several threads on zx-10r.net talking about what to do with the forks.
Thanks for the info. I tried to search .net but didn't see much.

Quote:
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Those 10's scare the out of me from things I have read.
I'll let you ride it sometime.
Just let me throw my leg over the Busa too
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Old 03-01-2009, 11:54 PM   #11
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I dont think I want to ride it. I would let you check out the Busa though.
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Old 03-02-2009, 10:25 AM   #12
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Gary,
Is it while you're leaned over coming out of a turn or just straight line acceleration?
Is it a tank slapper or just a wiggle in the bars?

How many miles are on it now?

When was your last fork or shock service?

Is the rear ride height stock or higher?

What size / brand tires are you running and at what pressure?

FWIW, the ZX10 stock spring rate is 1.0 , for your weight I'd recommend an .85 or .90 depending on your riding style.
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Old 03-02-2009, 10:36 AM   #13
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Quote:
Originally Posted by Patrick View Post
Gary,
Is it while you're leaned over coming out of a turn or just straight line acceleration?
Is it a tank slapper or just a wiggle in the bars?

How many miles are on it now?

When was your last fork or shock service?

Is the rear ride height stock or higher?

What size / brand tires are you running and at what pressure?

FWIW, the ZX10 stock spring rate is 1.0 , for your weight I'd recommend an .85 or .90 depending on your riding style.
Is this something a good aftermarket suspension, set up to style and weight, might be able to solve some of his problems?

Or is the stock zx10's suspension pretty good for high speed track days?
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Old 03-02-2009, 10:43 AM   #14
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Quote:
Originally Posted by lilmckee View Post
Is this something a good aftermarket suspension, set up to style and weight, might be able to solve some of his problems?

Or is the stock zx10's suspension pretty good for high speed track days?

Yes to question 1.

Question 2 is a bit more contingent upon rider weight, riding style etc.
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Old 03-02-2009, 10:47 AM   #15
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Quote:
Originally Posted by Patrick View Post
Yes to question 1.

Question 2 is a bit more contingent upon rider weight, riding style etc.


Is it best then, for gary, if he still notices shake after a suspension setup:

If he were to get a damper?

Or invest into some sort of after market suspension?



I appreciate the info.
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Old 03-02-2009, 11:01 AM   #16
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Damper first, that bike should have one regardless of premium suspension.
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Old 03-02-2009, 11:01 AM   #17
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Old 03-02-2009, 11:03 AM   #18
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For track use bikes, once a season.
For street use, I recommend every 10,000 miles.
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Old 03-02-2009, 11:05 AM   #19
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Old 03-02-2009, 11:09 AM   #20
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There's an old saying;
"If you service your fork / shock and notice a big difference, you waited too long."
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